MPC RENAISANCE Audio Interface

For the longest I was using a cheap m-audio interface for recording in Logic which worked fine. Since I bought the Ren I thought I'd try recording vocals through its mic input into Logic. Is there a way to mute my studio monitors on the Ren like my m-audio interface does once I plug in headphones? Also why do I only hear the left channel in my headphone when recording vocals. In theory I understand that I have the mic plugged in the left mic channel on the Ren & my voice is mono but on my cheap m-audio interface I just plug the mic in & I can hear my voice on both sides of my headphones automatically. I also noticed that the Ren main Volume knob does not work when using it as a interface. It seems that the Ren headphone jack volume knob becomes the main volume knob when using it strictly as an interface.

I figured it out. Please disregard the above post. The Renaissance is a beast. I swear this thing is the center of my studio. Cant wait tip 1.8 it's really going down.